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    <p>强缓存</p>
    <img src="./img/1.jpg" alt="1.jpg" />
    <img src="./img/2.jpg" alt="2.jpg" />
    <p>弱缓存</p>
    <img src="./img/3.jpg" alt="3.jpg" />
    <img src="./img/4.jpg" alt="4.jpg" />
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